A method for producing a plurality of LED illumination devices which each emit light having an average value of a first photometric parameter including producing a plurality of LED chips which emit light of the same color; measuring values of the first photometric parameter of the LED chips; combining the LED chips to form groups of at least two LED chips which have different values of the first photometric parameter such that differences in the average values of all the LED illumination devices are imperceptible to the human eye; and equipping a respective LED illumination device with a group of LED chips.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of producing a plurality of LED illumination devices which each emit light having an average value of a first photometric parameter and a further average value of a second photometric parameter comprising: producing a plurality of LED chips which emit light of a same color; measuring values of the first photometric parameter and values of the second photometric parameter of the LED chips, wherein the first photometric parameter is a color locus and the second photometric parameter is a brightness; combining the LED chips to form groups of at least two LED chips which have different values of the first photometric parameter and different values of the second photometric parameter such that differences in the average values and differences in the further average values of all the LED illumination devices are imperceptible to the human eye; and equipping a respective LED illumination device with a group of LED chips.
2. The method according to claim 1 , wherein the average values of all the LED illumination devices differ by less than 10% and/or by fewer than five MacAdam threshold units.
3. The method according to claim 1 , wherein a difference in values of the first photometric parameter of the LED chips of an LED illumination device is perceptible to the human eye.
4. The method according to claim 1 , wherein a difference in the values of the first photometric parameter of the LED chips of an LED illumination device is greater than five MacAdam threshold units.
5. The method according to claim 4 , wherein the average values of all the LED illumination devices differ by fewer than three MacAdam threshold units.
6. The method according to claim 1 , wherein the respective LED illumination device is assigned at least one further LED chip having a further value of the first photometric parameter and/or of the second photometric parameter.
7. A method of producing a plurality of LED chipsets for illumination devices which each emit light having an average value of a first photometric parameter and a further average value of a second photometric parameter comprising: producing a plurality of LED chips which emit light of a same color; measuring values of the first photometric parameter and values of the second photometric parameter of the respective LED chips, wherein the first photometric parameter is a color locus and the second photometric parameter is a brightness; and combining the LED chips to form groups of at least two LED chips which have different values of the first photometric parameter and different values of the second photometric parameter such that differences in the average values and differences in the further average values for the illumination devices are imperceptible to a human eye.
8. The method according to claim 7 , wherein the average values of all the LED illumination devices differ by less than 10% and/or by fewer than five MacAdam threshold units.
9. The method according to claim 7 , wherein a difference in the values of the first photometric parameter of the LED chips of an LED illumination device is perceptible to the human eye.
10. The method according to claim 7 , wherein difference in the values of the first photometric parameter of the LED chips of an LED illumination device is greater than five MacAdam threshold units.
11. The method according to claim 10 , wherein the average values of all the LED illumination devices differ by fewer than three MacAdam threshold units.
12. The method according to claim 7 , wherein a respective LED illumination device is assigned at least one further LED chip having a further value of the first photometric parameter and/or of the second photometric parameter.
13. An LED illumination device which emits light having an average value of a first photometric parameter and an average value of a second photometric parameter; has a first LED chip having a first value of the first photometric parameter and a first value of the second photometric parameter; and has a second LED chip having a second value of the first photometric parameter, said second value of the first photometric parameter being different from the first value of the first photometric parameter, the second LED chip further having a second value of the second photometric parameter, said second value of the second photometric parameter being different from the first value of the second photometric parameter, wherein a difference between the first and second values of the first photometric parameter is perceptible to the human eye, a difference between the first and second values of the second photometric parameter is perceptible to the human eye, and the first photometric parameter is the color locus and the second photometric parameter is brightness, and the LED chips emit light of a same color.
14. The LED illumination device according to claim 13 , wherein the first value of the first photometric parameter and the second value of the first photometric parameter differ by more than five MacAdam threshold units.
15. The LED illumination device according to claim 13 , wherein a radiation-transmissive covering containing scattering particles is disposed downstream of the LED chips in an emission direction.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 18, 2009
August 25, 2015
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